Listen there are some movies that are set in stone and the writer or the director does not want to change but I've never worked on a movie including my own that didn't take advantage of a rehearsal process.
By the way movies are like sporting events in that you're as good as the movie you're in. You can sit in a room for 20 years and go do a movie and you can just kill in it and you move to the head of the line again. By the same token you can do five movies a year and if they're dreck it's nothing.
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I've done performances in movies that I was immensely proud of and the movies didn't take off like a rocket at Cape Canaveral it didn't take off.